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W. OESTERREIGH' TELEPHONE SYSTEM.

" 3 Sheets-S heet 1.

(No Model.)

Patented Dec 11, 1894 (No Model.) 1 3 Sheets-Shag? 2.v

W. 03511111111311.1011. TELEPHONE SYSTEM.

Witne 55 e 5 5 111115111111" E Atturriy UNITED STATES PATENT OFFICE.

IVILHELM OESTERREIOH, OF BERLIN, GERMANY.

TELEPHONE SYSTEM.

spncrmcnrron forming part of Letters Patent no. 530,598, dated December 11, 1894.

Application filed October 12,1893. Serial No. 487,928- (No model.)

To all whom it may concern:

Be it known that I, WILHELM OESTERREICH, electrical engineer, a subject of the German... Emperor, residing at Berlin, in the Kingdom of Prussia and German Empire, have invented certain new and useful Improvements in Telephone Systems; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use'the same.

The present invention relates to improvements in telephone systems andis especially applicable to those plants in which in removing the telephone from the switch an electricbattery is put into the circuit connecting the said telephone with the earth. The essential feature .of my invention consists in the combination with. a multiple switch-board of a primary or secondary pile or battery which for the purpose of testing the' wires is connected with a circuit opposite to that of the telephone station in question by a circuitcloser. If in combination with the pile or battery mentioned an electric indicator, telephone or other means for ascertaining the presence of an electric current is employed,

'I may see from the movements of the index of such galvanometer, from the noise of the telephone or from any other suitable apparatus, Whether a line is in use or not.

A special feature of my invention consists in combining with the switch lever, which, serves to put the galvanometer or similar apparatus in or out of circuit, the handle of a Morse telegraph in such a manner as to err able the transmission of ordinary telegraphic dispatches through the line to be made.

In the annexed drawingsmy invention is represented, Figure 1 showing part of a telephone-plant and illustrating the electrical connection of the several wires and apparatus, an electric-indicator being used for indicating the electric current. In. Fig.2 a modification is represented in which instead of the electric-indicator a telephone isused. Figs. 3, 4, 5 and 6 illustrate'in a plan and in vertical sections, respectively, the switch for setting the controlling device at work.

In the telephoneplant represented in Fig. l the connection is efiiected in usual manner by a crank-switch U with levers ff which alternately may bebrought into contact with contact-pieces t and 25 respectively and with transmitter.

which is connected with the speaking apparatus of the person actuating and testing the plant. This latter speaking apparatus consists of the transmitter M, battery M B, in ductionQcoilJ R,and receiver T.

The speaking key D is used by the office to call the person who is to be spoken to, if this has not been done by the person who wishes to speak. The person in the office, for this purpose, presses the speaking key D, thus putting the speaking battery W B into circuit and permitting the current of the battery W B to go over the lever f and the wire 3', into the circuit that is to be employed.

The third part, 3, is connected with the battery W B and with earth, and also with the aforesaid speaking apparatus. The use of the keyD is to connect the part 1 with the parts 2 or*3 as required. The switch U is provided I with an additional switchD', which consists of the elements f t and t of an ordinary Morse Thecontact t for working position is connected with the sensitive galvanometer G and is then led to earth at E. The contact 25 for the position ofrest is connected with the zinc pole of a copper-zinc pileC B, the

copper-pole. of which is likewise connected with the earth at E.

The lever f of the switch is connected by the flexible leading wire .9 withthe contact-pin S The head of this pin is made of insulating material, so that when the pin is introduced into the oontact hole thetcontact-spring S P is lifted from the tube a andthe circuit broken. (See Fig. l.) The lever f is connected by the flexible leadingwire s with the part it of the contact pin S and lover f 2 is connected by the flexible leading-wire s with the point is of the same contact-pin. The head of the said con- ICO tact-pin is insulated from therear part by a diskn, and thewire s isc onnectedwith the said head, while the wires is connected with the rear part of the contact-pin.

ducing this pin into the contact-hole it may be seen that at first theconnection with the 05 In introwire 8 is established, while when the pin is fully introduced the contact-spring b is removed from contact-tube at, its V shaped part resting upon the head of the pin, whereas the rear part of the pin isin connection with the tube a.

If it is desirable to know whether a certain line is at a given time in use or not, the respectivetubea is touched with the point of the contact-pin S and the key f of the additional switch D is depressed, so that it comes in contact with as shown at the right hand in Fig. 4. The electric indicator G is thus 0011-. nected by t f s S K with the earth, which is indicated E in all figures. The electric indi-' cator is thus actuated in case the line tested is in use.

Figs. 4, 5 and 6 are respectively sections on y the lines ab, c-d, and.e-f, in Fig. 3, and

each figure shows the lever f in two positions, clearly illustrating how the variouscontacts are made. Fig. 3 also illustrates how the handle H is moved and shows it in two positions. When the leverf is at rest it is in contact with t as shown at the left hand in. Fig. 4, and when used for testing it is bent backward so as to come in contact with t as shown at the right hand in Fig. 4. Thelever f is insulated at that part which bears against the springs f andf.

The current of the testing battery is a weak current, and it is too weak to throw down the annunciator of any line to which it maybe connected, but it is strong enough to actuate the galvanometer which is very sensitive.

The current may come from the following diiferent sources: first from the battery 0 B of the telephone station L B. W'henthe telephone of the station is removed from the contact-hook the current of the element 0 B passes through the contact-tube a at switch board T B then to the point of the contactpin S and through wire 8, and finally through f t and through the electric indicatorG to the earth; second, from another battery similar to'battery G B, located at another station L B" to the right of O B, and connected to the switch-board at II B (or III B) provided the point 70 of the pin S has been inserted at the respective station into the similar con tact-tube a. The current issuing from this station passes for instance from contact II B to contact I B and in the same way to the electric indicator G and finally to the earth as before described. If in one or more stations to theleft'and to the rightthe telephones are removed the elements 0 B of all thesestations are put in parallel with-1e spect to the electric indicator Gand will actuate the same. From this there results that the leading wires when in use are always in connection with a weak source of electricity. from the station which enables an exact test of. the wire to bemade. [The test current passesthrough the wire even from the moment when the telephone at the respective station is taken from the contact hook. Forthe purpose of testing, the rings need only be touched with the point of the contact-pin S. In Fig. 1 of the annexed drawings a position is shown in which the current of the test battery C B at the central office passes through 6, f 850., to the test ring aof the switchboard I B and from here to L B, on the one hand, and to the annunciator K, on the other. In testing such a wire it would be found that it was in use. If, however, the contact-pin S is wholly inserted, the wire receives the current of the test battery from the station L, B, at the left hand in Fig. 1, before the telephone has been removed from the hook, the said station being connected by contact-pin S with the line wire. The current passes through S a s f and then either through 23' S K t or through 25 2 1 t to f s S" h a and finally to L B. Those partsof the wire situated to the right are provided with current from 0 B.

The usual employment of the switch U for switching the flexible leading-wires either to the speaking apparatus or to the clearingout apparatus is illustrated in Figs. 3, 4, 5 and 6. The lever f is turned to the left, so as to connect'f with t and f with t. The speaking apparatus is thereby inserted. The peculiarity of this device is thatilever f is made'elastic and serves asa key of an ordinary Morse-transmitter. In the right hand position of this, lever f is connected with i that is to say the testing battery 0 B, is in connection withs and with the point of the contact-pin. If 'now the wire is to be tested the button is turned to the side, so. that the lever f is'removed from t and pressed against 25 O B is thereby cut out and G inserted into the circuit.

The arrangement of the several lines-and apparatusinserted into them is .exactlythe same if instead of the electric indicator shown in Fig. 1 an acoustic or electro-acoustic indicator, such as a telephone is used. See Fig. 2.

IVhat I claim is- The combination, with a telephone system provided with a multipleswitch board; of .a

testing wire connected with the earth, andprovided. witha weak-battery, a galvanometer in a branch'wire, and a contact for connecting it with the circuit to be tested; and a switch provided. with a depressible and oscillatory lever f operatingwhen depressed toleave the contact 15 and touch the contact if, and operating. when moved to one side to move the springs fandf clear of the contactszf and t and .placethem in contact with the contacts 15 and 15 respectively, substantially asand for the purpose set forth.

In testimony whereot'I affix my signature in presence ot'two witnesses.

I/VILHELM T OESTERREIOI-I. 

